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Artigo Acesso aberto Revisado por pares

Antal Nógrádi, Ferenc Domoki, Rózsa Dégı̀, Stefánia Borda, Magdolna Pákáski, András Szabó, Ferenc Bari,

Abstract The resuscitation of asphyxiated babies is associated with changes in cerebral protein synthesis that can influence the neurological outcome. Insufficient gas exchange results in rapid shifts in extracellular and intracellular pH. Carbonic anhydrase (CA) plays an important role in buffering acute changes in pH in the brain. We investigated whether asphyxia/re‐ventilation influences the expression of cerebral CA isoforms (CA‐II, CA‐III and CA‐IV) in anaesthetized newborn pigs. The cerebral ...

Tópico(s): Ion channel regulation and function

2003 - Wiley | Journal of Neurochemistry

Artigo

Sándor Antus, Lóránd Farkas, Mihäly Nógrádi, Ferenc Boross,

Tachrosin [8-(2,3-dihydro-2,2-dimethyl-3-oxo-4-furyl)-5,7-dimethoxyflavone](1) has been synthesized by oxidative rearrangement of a 1-aryl-4-hydroxypent-1-en-3-one with thallium(III) nitrate followed by cyclisation to a 4-aryl-2,2-dimethylfuran-3(2H)-one as the key step. A multi-stage transformation of the flavone (1) gave 8-(3-hydroxy-3-methyl-2-oxobutyl)-5-methoxy-7-methoxycarbonylmethoxyflavone (29), which afforded in one step the furo[2,3-c]pyran (30). Reduction of (30) with borohydride and reoxidation ...

Tópico(s): Phytochemical Studies and Bioactivities

1977 - | Journal of the Chemical Society. Perkin transactions I/Journal of the Chemical Society. Perkin transactions. I

Artigo Revisado por pares

Rózsa Dégı̀, Clara R. Thore, Ferenc Bari, Nishadi Thrikawala, Antal Nógrádi, Robins. Greg, Ferenc Domoki, Tracy C Beasley, David W. Busija,

Tópico(s): Nitric Oxide and Endothelin Effects

2001 - Springer Science+Business Media | Graefe s Archive for Clinical and Experimental Ophthalmology

Artigo

Sándor Antus, Ferenc Boross, Mihäly Nógrádi,

Abstract Die Acetale 1–5 , die in 2‐Stellung ein durch eine benachbarte Carbonyl‐ oder Nitrilgruppe, zwei Estergruppen oder eine Phenyl‐ und eine Estergruppe aktiviertes Wasserstoffatom enthalten, neigen zum alkalikatalysierten Alkoxyaustausch und/oder zur Alkoholabspaltung (zu den Vinylethern 6 ) sowie in Anwesenheit von Wasser zur Hydrolyse.

Tópico(s): Chemical Reaction Mechanisms

1978 - Wiley | Justus Liebig s Annalen der Chemie

Artigo Revisado por pares

Ferenc Faigl, Elemér Fogassy, Mihäly Nógrádi, Emese Pálovics, József Schindler,

Non-racemic enantiomeric mixtures form homochiral and heterochiral aggregates in melt or suspension, during adsorption or recrystallization, and these diastereomeric associations determine the distribution of the enantiomers between the solid and other (liquid or vapour) phases. That distribution depends on the stability order of the homo- and heterochiral aggregates (conglomerate or racemate formation). Therefore, there is a correlation between the binary melting point phase diagrams and the experimental ...

Tópico(s): Analytical Chemistry and Chromatography

2010 - Royal Society of Chemistry | Organic & Biomolecular Chemistry

Artigo Revisado por pares

Ferenc Faigl, Elemér Fogassy, Mihäly Nógrádi, Emese Pálovics, József Schindler,

Despite the dramatic development of enantioselective synthesis and chromatographic separation methods, resolution still remains the most inexpensive and operationally simplest method for producing pure enantiomers on a large scale. No extreme conditions or expensive reagents are required and the expensive resolving agents can be eventually recovered. This review presents guidelines for selecting the optimal method for resolving a given racemate and is based mainly on the authors long experience ...

Tópico(s): Mass Spectrometry Techniques and Applications

2008 - Elsevier BV | Tetrahedron Asymmetry

Artigo

Sándor Antus, E. BAITZ‐GACS, Ferenc Boross, Mihäly Nógrádi, Aniko M Sólyom,

Abstract Bei der Oxidation mit Thallium(III)‐nitrat in Methanol werden die 1,3‐Diphenyl‐1,3‐propandione 1 zu den 3‐Oxo‐2,3‐diphenylpropansäureestern 2 und deren Folgeprodukte umgelagert. Die 1‐(2‐Hydroxyphenyl)‐3‐phenyl‐1,3‐propandione 1h–k werden dagegen oxidativ zu den 2‐Aroyl‐3(2 H )‐benzofuranonen 5 cyclisiert. — Der durch Alkalilauge und Säure katalysierte Abbau von 5 wird diskutiert.

Tópico(s): Vanadium and Halogenation Chemistry

1980 - Wiley | Liebigs Annalen der Chemie

Artigo

Lóránd Farkas, Ferenc Sóti, Mária Incze, Mihäly Nógrádi,

Abstract Die erste Synthese von 3,7‐Dihydroxy‐1‐methyldibenzo‐α‐ pyron (Autumnariol, 1 ) und 3,7‐Dihydroxy‐4‐methoxyl‐1‐methyldibenzo‐α‐pyron (Autumnariniol, 2 ) wird beschrieben.

Tópico(s): Phytochemistry and Biological Activities

1974 - Wiley | Chemische Berichte

Artigo Acesso aberto Revisado por pares

S. D. Katz, Ferenc Niedermayer, Dániel Nógrádi, Cs. Török,

We study three possible ways to circumvent the sign problem in the O(3) nonlinear sigma model in $1+1$ dimensions. We compare the results of the worm algorithm to complex Langevin and multiparameter reweighting. Using the worm algorithm, the thermodynamics of the model is investigated, and continuum results are shown for the pressure at different $\ensuremath{\mu}/T$ values in the range 0--4. By performing $T=0$ simulations using the worm algorithm, the Silver Blaze phenomenon is reproduced. Regarding ...

Tópico(s): Spectroscopy and Quantum Chemical Studies

2017 - American Physical Society | Physical review. D/Physical review. D.

Artigo

Sándor Antus, Ferenc Boross, Mihäly Nógrádi,

S. Antus, F. Boross and M. Nógrádi, J. Chem. Soc., Chem. Commun., 1977, 333 DOI: 10.1039/C39770000333

Tópico(s): Chemical Reaction Mechanisms

1977 - Royal Society of Chemistry | Journal of the Chemical Society Chemical Communications

Artigo

Sándor Antus, L. Farkas, Mihäly Nógrádi, Ferenc Boross,

Abstract Oxidative Umlagerungsreaktion des Hydroxyketons (I) und nachfolgende Cyclisierung geben das Furanon (II), sukzessive Debenzylierung [→(IIIa)], Houben‐Hösch‐Reaktion mit Acetonitril [‐ (IIIb)], Benzoylierung [‐+ (IIIc) ] und Baker‐Venkataraman‐Umlagerung mit KOH/Pyridin führen zum Diketon (IIId), dessen Dehydratisierung Tachrosin (IV) liefert.

Tópico(s): Metal-Catalyzed Oxygenation Mechanisms

1977 - Wiley | Chemischer Informationsdienst

Artigo

Sándor Antus, Ferenc Boross, M. KAJTAR‐PEREDY, Mihäly Nógrádi,

Abstract [1′ RS (3 RS )]‐1‐(2,3‐Dihydro‐4‐hydroxy‐6‐methoxy‐1‐benzofuran‐3‐yl)‐2‐methyl‐1,2‐propandiol ( 21 ), eine Teilstruktur der Titelsubstanz 1 , wurde aus Phloroglucin in 11 Schritten synthetisiert. Als Schlüsselreaktion diente die oxidative Umlagerung des Benzalacetonderivates 5 mit Tl(NO 3 ) 3 in Methanol zu dem 2‐Aryl‐1,1‐dimethoxyethan 8 gefolgt vom Ringschluß an der durch Entbenzylierung freigesetzten Hydroxygruppe von 9 . Die Überführung von 21 in Verbindungen der Struktur 1 blieb ebenso erfolglos wie ...

Tópico(s): Phytochemistry and Biological Activities

1984 - Wiley | Liebigs Annalen der Chemie

Artigo

Sándor Antus, Ferenc Boross, M. KAJTAR‐PEREDY, Lajos Radics, Mihäly Nógrádi,

Abstract Sterisch unbehinderte Aryliden‐ und Diarylidenacetone 1 bzw. 2 mit elektronenspendenden Aryl‐gruppen liefern mit Thallium(III)‐nitrat in Methanol die β‐Ketoacetale 3, 4 bzw. 5 . Das elektronegativ substituierte 1f sowie die sterisch gehinderten Acetonderivate 1g und 1h ergeben die 4‐Arylcrotonsäureester 7 und Nebenprodukte, während aus 1,3‐Dibenzylidenaceton ( 2a ) neben den erwarteten Produkten auch die verzweigten Acetalester 13a und 13b entstehen. Für die Bildung der anomalen Produkte 7 und ...

Tópico(s): Asymmetric Synthesis and Catalysis

1980 - Wiley | Liebigs Annalen der Chemie

Artigo

Lóránd Farkas, Ferenc Sóti, Mária Incze, Mihäly Nógrádi,

... MARIA INCZESearch for more papers by this authorMIHALY NOGRADI, MIHALY NOGRADISearch for more papers by this author LORAND FARKAS, LORAND FARKASSearch for more papers by this authorFERENC SOTI, FERENC SOTISearch for more papers by this authorMARIA INCZE, MARIA INCZESearch for more papers by this authorMIHALY NOGRADI, MIHALY NOGRADISearch for more papers by this author ...

Tópico(s): Chemical Synthesis and Reactions

1975 - Wiley | Chemischer Informationsdienst

Artigo

Sándor Antus, E. BAITZ‐GACS, Ferenc Boross, Mihäly Nógrádi, Aniko M Sólyom,

Abstract Beim Erhitzen mit 1.4 Äquiv.

Tópico(s): Chemical Reaction Mechanisms

1980 - Wiley | Chemischer Informationsdienst

Artigo

Sándor Antus, Ferenc Boross, Mihäly Nógrádi,

Abstract Acetale, die in 2‐Stellung ein durch eine benachbarte CO‐ oder CN‐Gruppe, zwei Estergruppen oder eine Phenyl‐ und eine Estergruppe aktiviertes H‐Atom enthalten, neigen zum alkalikatalysierten Alkoxyaustausch und/oder zur Alkoholabspaltung unter Bildung von Vinylethern sowie in Anwesenheit von Wasser zur Hydrolyse.

Tópico(s): Inorganic and Organometallic Chemistry

1978 - Wiley | Chemischer Informationsdienst

Artigo

Sándor Antus, Ferenc Boross, M. Nógrádi,

Abstract Die Acetale (I)‐(VI) mit dissoziierbarem α‐Proton lassen sich unter Alkoxyd‐Katalyse mit primären Alkoholen über (VII) zu (VIII) transacetalisieren.

Tópico(s): Chemical Synthesis and Analysis

1977 - Wiley | Chemischer Informationsdienst

Artigo Acesso aberto Revisado por pares

Viktor Pajer, Ferenc Rárosi, Lajos Kolozsvári, B. Hopp, Antal Nógrádi,

Abstract The purpose of the present study was to determine the age dependence of the ultraviolet (UV) absorption of the different parts of the human crystalline lens. Cryostat sections of human cadaveric lenses (60 μm) were cut. The UV absorbance of nine samples, derived from different parts of the lens, was determined using a Shimadzu scanning spectrophotometer. The absorbance of the anterior and posterior lens capsules was measured separately. The absorption coefficients were calculated from the ...

Tópico(s): Urinary Tract Infections Management

2019 - Wiley | Photochemistry and Photobiology

Artigo

Sándor Antus, Ferenc Boross, J. GIBER, M. KAJTAR‐PEREDY, Mihäly Nógrádi,

Abstract (3 RS , 3a SR ,8a SR )‐2,3,3a,8a‐Tetrahydro‐3‐hydroxy‐4,6‐dimethoxy‐2,2‐dimethylfuro[2,3‐ b ]benzofuran ( 29 ), eine Teilstruktur der Titelsubstanz 2 , wurde aus Phloroglucin in 11 Schritten synthetisiert, konnte jedoch nicht in rac ‐ 2 übergeführt werden. Einige z. T. Unerwartete Reaktionen der Zwischenprodukte, u.a. eine durch Pyridin katalysierte transannulare Wasserstoffverschiebung ( 22 → 23 ), werden beschrieben.

Tópico(s): Synthesis of Organic Compounds

1985 - Wiley | Liebigs Annalen der Chemie

Artigo

Ferenc Faigl, Elemér Fogassy, Mihäly Nógrádi, Emese Pálovics, József Schindler,

ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Tópico(s): Spectroscopy and Quantum Chemical Studies

2010 - Wiley | ChemInform

Artigo

Ferenc Faigl, Elemér Fogassy, Mihäly Nógrádi, Emese Pálovics, József Schindler,

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Tópico(s): Spectroscopy and Quantum Chemical Studies

2008 - Wiley | ChemInform

Artigo

Sándor Antus, Ferenc Boross, M. KAJTAR‐PEREDY, Mihäly Nógrádi,

Abstract Nach Durchführung von Modellversuchen wird durch Reaktion des Aldehyds (I) mit dem Hydroxyketon (II) über die Stufen (III)‐(V) das Benzofuran (VI) synthetisiert.

Tópico(s): Silicone and Siloxane Chemistry

1984 - Wiley | Chemischer Informationsdienst

Artigo Acesso aberto Revisado por pares

Anna Linda Nógrádi, Iain Cope, Attila Arany‐Tóth, Linda Müller, Dóra Csatári, Csaba Hetyey, Zoltán Dudás-Györki, Ferenc Manczur, Norbert Schuster, Csaba Jakab, Tibor Németh,

Urinary bladder tumors are not common in guinea pigs, but case numbers being diagnosed have increased in the past years. The authors present 3 referred cases of primary urinary bladder tumors in pet guinea pigs diagnosed using diagnostic imaging (CT, radiography, and ultrasonography) and exploratory laparotomy. Excision was not possible in the first case as the tumor was located at the neck of the urinary bladder and the owner opted for intraoperative euthanasia. The second and third cases both had ...

Tópico(s): Veterinary Pharmacology and Anesthesia

2023 - Elsevier BV | Topics in companion animal medicine

Artigo

Sándor Antus, Ferenc Boross, J. GIBER, M. KAJTAR‐PEREDY, Mihäly Nógrádi,

Abstract Das Enon (I) ist in sieben Schritten aus Phloroglucin nach literaturbekanntem Verfahren zu erhalten und wird, ebenfalls nach Literaturverfahren, in das Benzylderivat (II) übergeführt.

Tópico(s): Carbohydrate Chemistry and Synthesis

1985 - Wiley | Chemischer Informationsdienst

Artigo

Sándor Antus, Ferenc Boross, M. KAJTAR‐PEREDY, Lajos Radics, Mihäly Nógrádi,

Abstract Die sterisch ungehinderten Benzylidenacetone (I) bzw. Dibenzylidenacetone (III) reagieren mit 1 Äquiv.

Tópico(s): Inorganic and Organometallic Chemistry

1980 - Wiley | Chemischer Informationsdienst